| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over [art] long period | 183 |
|
| 2 | [verb] over [art] period | 126 |
|
| 3 | [verb] over [art] long | 44 |
|
| 4 | [verb] [art] long period | 31 |
|
